stompandgo
Well-Known Member
- Region
- USA
What does a Super El-Nino winter mean to your area? For us, I hear that it means a mild winter. Our hurricane season is almost over and we've had very little activity other than a few big Nor'easters.
What does a Super El-Nino winter mean to your area? For us, I hear that it means a mild winter. Our hurricane season is almost over and we've had very little activity other than a few big Nor'easters.
Similar prediction of a mild winter for us in B.C.What does a Super El-Nino winter mean to your area? For us, I hear that it means a mild winter. Our hurricane season is almost over and we've had very little activity other than a few big Nor'easters.
Similar prediction of a mild winter for us in B.C.
During strong El Niño events, coastally trapped Kelvin waves routinely propagate all the way up the North American West Coast to the Pacific Northwest and British Columbia (around 50°N), and during major events, measurable sea-level and temperature signals can reach as far north as the Gulf of Alaska (around 55°N–60°N).
As these subsurface waves travel poleward from the equator at roughly 150 miles per day, several factors govern how far north they remain coherent:
Because the wave takes weeks to months to travel from the tropics to high latitudes, the oceanic sea-level rise and warming arrive in British Columbia and Alaska well after they hit Southern California—often compounding winter storm surges and king tides.
- California to the Pacific Northwest (32°N–50°N): The wave signal remains strong and well-defined along California, Oregon, Washington, and Vancouver Island, where it temporarily raises local sea levels by 6 to 12 inches, deepens the thermocline, and suppresses cold, nutrient-rich upwelling.
- Gulf of Alaska (55°N–60°N): During "super" El Niños (such as 1982–83, 1997–98, and 2015–16), tide gauges and satellite altimetry detect the poleward-propagating sea-level anomaly wrapping around the Gulf of Alaska before dissipating against complex coastal topography and strong local atmospheric forcing.
- Energy Loss Along the Way: As a coastal Kelvin wave moves into higher latitudes, it gradually weakens due to friction, scattering from underwater canyons and islands (like the Channel Islands or Vancouver Island), and offshore energy radiation as Rossby waves.
Yes, but as your research indicates, Vancouver Island is a significant buffer indeed. Over time of course beaches around here on the "lower mainland" do need to be refreshed, and sea walls repaired etc. But in my lifetime structures such as the Stanley park sea wall have required little repair and very little "shoring up".This made me wonder, do El Nino effects on coastal sea level and surface temperatures typically reach you in Vancouver? Short answer: For stronger events like the current one, yes.
Long answer from Gemini AI:
I don't believe everything AI says, but this aligns well with other sources I"ve checked.
Next question is for you: Does coastal Vancouver get wave damage during stronger El Nino events?
Most of our big winter swell comes from big Gulf of Alaska storms. These waves attenuate little with distance over open ocean, but Vancouver's a lot closer to the source than we are.
If you get higher sea levels from El Nino, and the Gulf of Alaska gets stormier, that could be a wave erosion problem for Vancouver's west coast. Any idea how that's played out historically?
Thanks. That's an interesting take on the fish population. Makes sense. We have a different problem here with fish populations. Overfishing of bait fish by huge surface dredges, owned by conglomerates like Omega, that will wipe out a significant part of the baitfish in the Northern Gulf of Maine (NGOM, from the Canadian border to the southeastern tip of Cape Cod) in a week. Then they leave, come back in a few weeks, and wipe them out again.Generally wetter, stormier winters, increased snowpack in the high mountains, higher tides due to Kelvin waves and the thermal expansion of the top of the water column, and supression of the normal coastal upwelling that brings deep nutrients to the surface. The last hurts fish populations and the fishermen and sea birds that depend on them.
Sand coming back in some of the beaches.
Thanks. That's an interesting take on the fish population. Makes sense. We have a different problem here with fish populations. Overfishing of bait fish by huge surface dredges, owned by conglomerates like Omega, that will wipe out a significant part of the baitfish in the Northern Gulf of Maine (NGOM, from the Canadian border to the southeastern tip of Cape Cod) in a week. Then they leave, come back in a few weeks, and wipe them out again
It gets complicated when considering species like salmon that spend part of their lifecycle in freshwater and part in saltwater. I found the blog entry below to be really interesting.....supression of the normal coastal upwelling that brings deep nutrients to the surface. The last hurts fish populations and the fishermen and sea birds that depend on them.